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HyperText Markup Language (HTML) is the core language of nearly all Web content. Most of what you see on screen in your browser is described, fundamentally, using HTML. More precisely, HTML is the language that describes the structure and the semantic content of a Web document. Content within a Web page is tagged with HTML elements such as {{HTMLElement("img")}}, {{HTMLElement("title")}}, {{HTMLElement("p")}}, {{HTMLElement("div")}}, and so forth.

HTML is an international standard whose specifications are maintained by the World Wide Web Consortium and the WHATWG. It's considered a "living standard" and is technically always under constructions. The always-current version of the HTML specification is referred to as HTML5.

HTML5 is the latest version of HTML and XHTML.The HTML standard defines a single language that can be written using the relaxed HTML syntax, but also the more strict XML one, and also addresses the needs of web applications.

HTML5 does not describe the style and formatting of content, but only the content itself and its meaning. Style and formatting is defined and controlled using Cascading Style Sheets (CSS).

The articles here provide reference materials you can refer to while you developer for the Web.

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<p><strong><img alt="" src="/files/3563/HTML5_Logo_128.png" style="width: 128px; height: 128px; margin: 6px; float: left;" /><span class="seoSummary">HyperText Markup Language (HTML)</span></strong><span class="seoSummary"> is the core language of nearly all Web content. Most of what you see on screen in your browser is described, fundamentally, using HTML.</span> More precisely, HTML is the language that describes the structure and the semantic content of a Web document. Content within a Web page is tagged with HTML elements such as {{HTMLElement("img")}}, {{HTMLElement("title")}}, {{HTMLElement("p")}}, {{HTMLElement("div")}}, and so forth.</p>
<p>HTML is an international standard whose specifications are maintained by the <a class="external" href="http://www.w3.org/">World Wide Web Consortium</a> and the <a href="http://www.whatwg.org/" title="http://www.whatwg.org/">WHATWG</a>. It's considered a "living standard" and is technically always under constructions. The always-current version of the HTML specification is referred to as <strong>HTML5</strong>.</p>
<p>HTML5 is the latest version of HTML and XHTML.The <a href="http://www.whatwg.org/specs/web-apps/current-work/multipage/" title="http://www.whatwg.org/specs/web-apps/current-work/multipage/">HTML standard</a>&nbsp;defines a single language that can be written using the relaxed HTML syntax, but also the more strict XML one, and also addresses the needs of web applications.</p>
<p>HTML5 does<strong> not</strong> describe the style and formatting of content, but only the content itself and its <strong>meaning</strong>. Style and formatting is defined and controlled using <a href="/en-US/docs/CSS" title="/en-US/docs/Web/CSS"><strong>Cascading Style Sheets</strong></a> (CSS).</p>
<p><span class="seoSummary">The articles here provide reference materials you can refer to while you developer for the Web.</span></p>
<div class="cleared topicpage-table">
<div class="section">
<h2 class="Documentation" id="Documentation" name="Documentation">Documentation about HTML</h2>
<dl>
<dt>
<a href="/en-US/docs/Web/Guide/HTML/Introduction" title="Introduction to HTML"><strong>Introduction to HTML</strong></a></dt>
<dd>
An introductory guide to HTML, including its syntax and usage.</dd>
<dt>
<a href="/en-US/docs/Web/HTML/Element" title="HTML/Element">HTML element reference</a></dt>
<dd>
A detailed reference of all HTML elements and their features, capabilities, and compatibility with various browsers.</dd>
<dt>
<a href="/en-US/docs/Web/HTML/Attributes" title="HTML/Attributes">HTML attribute reference</a></dt>
<dd>
A list of all HTML attributes and which elements they can be used with.</dd>
<dt>
<a href="/en-US/docs/Web/Guide/HTML" title="/en-US/docs/Web/Guide/HTML">HTML guide</a></dt>
<dd>
Guides and tutorial content to help you learn and use HTML.</dd>
</dl>
<p><span class="alllinks"><a href="/en-US/docs/tag/HTML" title="Article tagged: HTML">View All...</a></span></p>
<h2 class="Related_Topics" id="Related_Topics" name="Related_Topics">Related Topics</h2>
<ul>
<li>The <a href="/en-US/docs/CSS" title="CSS">Cascading Style Sheets (CSS)</a> used to give style to HTML.</li>
<li>The <a href="/en-US/docs/DOM" title="Document Object Model (DOM)">Document Object Model (DOM)</a> is the representation of an HTML document as a tree of objects.</li>
</ul>
</div>
<div class="section">
<h2 class="Community" id="Community" name="Community">Getting help from the community</h2>
<p>You need help on a HTML-related problem and can't find the solution in the documentation?</p>
<ul>
<li>Consult the dedicated Mozilla forum : {{DiscussionList("dev-tech-html", "mozilla.dev.tech.html")}}</li>
<li>Go to <a href="http://stackoverflow.com/questions/tagged/html" title="http://stackoverflow.com/questions/tagged/css">Stack Overflow</a>, a collaboratively built and maintained Q&amp;A site and look if you can find the answer to your question. If not you will be able to ask your question there.</li>
</ul>
<p><span class="alllinks"><a href="http://www.catb.org/~esr/faqs/smart-questions.html">Don't forget about the <em>netiquette</em>...</a></span></p>
<h2 class="Tools" id="Tools" name="Tools">Tools for HTML developers</h2>
<ul>
<li>Recent versions of Firefox include built-in <a href="/en-US/docs/Tools#Integrated_into_Firefox" title="/en-US/docs/Tools#Integrated_into_Firefox">Web Developer tools</a>, such as the <a href="/en-US/docs/Tools/Web_Console" title="/en-US/docs/Tools/Web_Console">Web Console</a>, <a href="/en-US/docs/Tools/Page_Inspector" title="/en-US/docs/Tools/Page_Inspector">Page Inspector</a>, <a href="/en-US/docs/Tools/Style_Editor" title="/en-US/docs/Tools/Style_Editor">Style Editor</a>, and <a href="/en-US/docs/Tools/Responsive_Design_View" title="/en-US/docs/Tools/Responsive_Design_View">Responsive Design View</a> that assist with developing, debugging, and improving Web pages</li>
<li>Firefox' <a class="link-https" href="https://addons.mozilla.org/en-US/firefox/addon/1843">Firebug extension</a><span class="external">, a popular</span> extension of that navigator that allows to edit live CSS on watched sites. Very practical to test some changes, though this extension does much more.</li>
<li><a class="external" href="http://validator.w3.org/">HTML Validator</a></li>
<li><a class="link-https" href="https://addons.mozilla.org/en-US/firefox/addon/web-developer/">Web Developer Extension</a></li>
<li><a class="external" href="http://tidy.sourceforge.net/">HTML Tidy</a></li>
<li><a class="external" href="http://prettydiff.com/?html">Pretty Diff</a></li>
</ul>
<p><span class="alllinks"><a href="/en-US/docs/tag/HTML:Tools" title="Article tagged: HTML:Tools">View All...</a></span></p>
</div>
</div>
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